A problem with this, is that often the WTF go unsaid in public due to political reasons. My boss is the one who exclaims WTF the most in public. However, he generates a heck of a lot of WTF in private. Also, many of the WTF we generate are actually due to our coding around his WTFs.
This is just a restatement of the Principle of Least Astonishment
eg bad coder gets tons of WTFs, is a bad coder He WTFs at everything because he has no clue, doesn't understand, but his WTF's are weighted low.